Elizabeth Bishop - Sonnet (1979)

Caught -- the bubble
in the spirit level,
a creature divided;
and the compass needle
wobbling and wavering,
undecided.
Freed -- the broken
thermometer's mercury
running away;
and the rainbow-bird
from the narrow bevel
of the empty mirror,
flying wherever
it feels like, gay!

Elizabeth Bishop

http://www.poemhunter.com/poem/sonnet-1979/